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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Find an email library for the language you are using. For PHP I used this. Check the examples directory and make them work. If you are using another language, you'll definitely find an email library.
Start with a simple API! Just a GET endpoint that returns the time or something like that. Once that is working, you can extend its functionalities to whatever you want. Again, you'll find API libraries for all common languages. I used this for PHP.
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